Assembly comprising a support bracket, which diverts reaction torques, and a power screwdriver

Abstract

A power screwdriver has a gear housing with forwardly extending output shaft and a peripheral external spline with teeth lying on a first diameter. The gear housing has a peripheral groove with groove bottom arranged rearward of the external spline. The groove bottom lies on a second diameter smaller than the first diameter. The support bracket has a fastening portion with an annular fastening flange with internal spline and a support foot arranged laterally offset from the output shaft and placed against an external counter bearing for diverting reaction torques. Internal and external splines cooperate to rotationally fix the support bracket relative to the gear housing. A locking element on the fastening flange can assume a blocking setting or a release setting. In the blocking setting, the locking element extends partially or completely into the groove and locks the support bracket to the gear housing in longitudinal direction.

What is claimed is: 
     
       1. An assembly comprising:
 a support bracket ( 1 ) configured to divert reaction torques; 
 a power screwdriver ( 2 ) comprising a drive part ( 3 ) and a gear housing ( 4 ) comprising an output shaft ( 7 ) extending forwardly out of the gear housing ( 4 ) in a longitudinal direction of the output shaft ( 7 ); 
 the gear housing ( 4 ) comprising an external spline ( 8 ) extending peripherally around the gear housing ( 4 ), wherein the external spline ( 8 ) comprises teeth ( 9 ) with tips lying on a circle of a first diameter; 
 the gear housing ( 4 ) comprising a peripheral groove ( 10 ) arranged rearwardly of the external spline ( 8 ) and extending about a periphery of the gear housing ( 4 ), wherein the peripheral groove ( 10 ) comprises a groove bottom ( 11 ) and the groove bottom ( 11 ) lies on a second diameter (D 1 ) which is smaller than the first diameter (D 2 ), wherein the teeth ( 9 ) extend rearwardly up to the peripheral groove ( 10 ); 
 the support bracket ( 1 ) comprising a fastening portion ( 15 ) and further comprising a support foot ( 18 ), wherein the fastening portion ( 15 ) comprises an annular fastening flange ( 16 ) comprising an internal spline ( 16   a ); 
 the support foot ( 18 ) arranged laterally offset from the output shaft ( 7 ) and configured to be placed against an external counter bearing; 
 the internal spline ( 16   a ) of the annular fastening flange ( 16 ) cooperating with the external spline ( 8 ) of the gear housing ( 4 ) such that the support bracket ( 1 ) is rotationally fixed relative to the gear housing ( 4 ); 
 a fixing apparatus comprising a locking element ( 20 ) arranged on the annular fastening flange ( 16 ) and configured to assume a blocking setting or a release setting, wherein, in the blocking setting, the locking element ( 20 ) extends partially or completely into the groove ( 10 ) and locks the support bracket ( 1 ) to the gear housing ( 4 ) in the longitudinal direction; 
 the fixing apparatus further comprising an actuating element ( 21 ) and a compression spring ( 30 ), wherein the actuating element ( 21 ) comprises a pin ( 31 ) comprising a longitudinal axis, wherein the longitudinal axis is arranged tangentially relative to the annular fastening flange ( 16 ) and wherein the pin ( 31 ) is displaceable in a direction of the longitudinal axis and tangentially to the annular fastening flange ( 16 ) in the annular fastening flange ( 16 ), wherein the pin ( 31 ) is pretensioned against the compression spring ( 30 ) arranged at a first end of the pin ( 31 ) in the longitudinal direction, wherein the pin ( 31 ) comprises a recess ( 35 ), wherein the recess ( 35 ) extends in a radial direction relative to the longitudinal axis and is configured to partially receive the locking element ( 20 ) in the release setting. 
 
     
     
       2. The assembly according to  claim 1 , wherein the actuating element ( 21 ) further comprises a widened head ( 37 ) connected to a second end of the pin ( 31 ) opposite the first end, wherein the pin ( 31 ) is guided in a bore ( 36 ) of the fastening flange ( 16 ). 
     
     
       3. The assembly according to  claim 2 , wherein the compression spring ( 30 ) is supported with a first spring end against the first end of the pin ( 31 ) facing away from the widened head ( 37 ) and is supported with a second spring end opposite the first spring end against a plug ( 40 ) closing off the bore ( 36 ) of the annular fastening flange ( 16 ) in an outward direction. 
     
     
       4. The assembly according to  claim 3 , wherein the plug ( 40 ) is pressed into the bore ( 36 ) or fastened in the bore ( 36 ) by screwing.